James and sarah went out to lunch the price of lunch for both of them was $20 they tip their server 20% of that amount how much did each person pay if they share the price of lunch at the tip equally

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth